446 



osmotic pressure, effect on egg, 145. 

 Ostracodermi, 289, 290, Figs. 135, 



136. 



Otaria Jiookeri, paddles, Fig. 100. 

 otter sheep, 154. 

 ovary, of animals, 113, 116. 



,, ,, flower, 107. 

 oviducts, 125. 

 ovotestis, 113. 

 ovule, 48, 106, 107, Fig. 55. 

 ovum, 85. 



,, interpretation, 279. 



,, maturation, 133, Figs. 65, 68. 



,, of Auiphioxus, 45, Fig. 13. 



,, Ascaris, 131, Fig. 64. 

 bird, 140, Fig. 70. 

 Chara, 141. 

 ,, Coccidium, 88, Fig. 39. 

 ,, ,, Eudorina, 91, Fig. 40. 

 fern, 104, Fig. 52. 

 ,, flowering plant, 108, 109, 



Fig. 55. 



Fucus, 100, Fig. 47. 

 ,, ,, Hydra, 116, Figs. 57, 59. 

 ,, ,, mammals, 71, 271, Fig. 



140. 



,, ,, meduste, 121. 

 ,, ,, plants, 141. 

 ,, ,, rabbit, Fig. 71. 

 ,, ,, sponges, 113. 

 Volvox, 91, Fig. 11. 

 segmentation of, 263, 265. 

 ,, similarity in different or- 

 ganisms, 162. 

 size of, 267. 

 typical, 140, Fig. 69. 

 oxen, feet, 241. 

 oxidation, 5. 

 oxlip, fertilization, 356. 

 oxygen, 5, 6, 8, 31. 

 oyster, American, introduced, 323. 



P. 



PADDLES, 236, 244, 247. 

 pademelons, coloration, 337. 

 psedogenesis, 144. 

 pairing of chromosomes, 133, 137, 



206, Figs. 65, 66, 68. 

 Palseohatteria, 295. 

 Palseomastodon, 313, Fig. 159. 

 palaeontology, evidence afforded by, 



287304. 



Palseospondylus, 289. 

 Palaeozoic Era, 284, 285. 

 palingenetic characters, 277. 

 palms, climbing, 350. 



Pandorina, 42, 89, Fig. 10. 

 pangenesis, 164166, 369,' Fig. 76. 

 Papilio, mimicry in, 346 348, 



Fig. 177. 

 parallel modification of body and 



germ cells, 182. 



Paramoecium, 39, 98, 139, Fig. 8. 

 paraphyses, of Fucus, 100. 

 parasites, peculiarities of, 401 403. 

 parasitism, of gametophyte, 112. 

 parenchyma, 65. 

 Pariasaurus, 297, Fig. 140. 

 parietal eyes, 258260, Figs. 114 



116. 



,, foramen, 260. 

 parthenogenesis, 143, 144. 



artificial, 144147. 

 Parmpalustris, distribution, 319,320. 

 passivity of female, 84, 85. 

 Pasteur, 215. 



Patagonia, beech forests, 329. 

 paternal chromosomes, 137, Fig. 68. 

 peach trees, inheritance of acquired 



characters, 182. 



peacock, epigamic ornamentation,349. 

 Pearson, Karl, 210. 

 pea, Sicilian, 208. 

 ,, structure and germination of 



seed, Fig. 56. 

 peas, Mendelian experiments on, 



196199. 



pedigrees, 229, 311. 

 Peebles, Florence, 28. 

 pelagic organisms, 322, 336. 

 pentacrinoid stage of Antedon, 274, 



275, Fig. 124. 



Pentacrinus, 274, Fig. 125. 

 pentadactyl limbs, 237, 294 (see also 



limbs and feet), 

 periblem, 50. 



Pericopis angulosa, 345, Fig. 176. 

 Peripatus, Fig. 167. 



,, distribution, 330. 

 perisarc, 119. 

 perissodactyl, 241, 253. 

 peristaltic movement, 57. 

 peritoneal epithelium, 54, Fig. 16. 

 Permian Epoch, 284. 

 Perrliybris malenka, 345, Fig. 176. 

 persons in colony, 119. 

 Petalotricha, Fig. 9. 

 petals, 106. 



phagocytes, phagocytosis, 52. 

 phalangers, 301. 

 phalanges, 238. 



Phascolotherium, 302, Fig. 149. 

 Phenacodus, 309, Fig. 152. 



